//
//  UIButton+Extension.swift
//  weibokj
//
//  Created by 李 on 16/4/7.
//  Copyright © 2016年 李. All rights reserved.
//

import UIKit

extension UIButton{

    //便利构造函数
    convenience init(imageName:String, backImageName:String){
    
        self.init()
       setImage(UIImage(named:imageName), forState: UIControlState.Normal)
       setImage(UIImage(named: imageName + "_highlighted"), forState: UIControlState.Highlighted)
       setBackgroundImage(UIImage(named: backImageName), forState: UIControlState.Normal)
       setBackgroundImage(UIImage(named: backImageName + "_highlighted"), forState: UIControlState.Highlighted)
        
        //会根据背景图片的大小调整尺寸
        sizeToFit()
        
    }
}
